Furnace.



2 SHEETS-SHEET x Si Q Lived-75:62:

PATENTBD MAY l 1906. J. G. TELLER.

PURNAGE.

urmonrox rum: n! 2s, ma.

2 SHEETS-BEEF! 3.

UNITED STATES IJAATENT OFFICE.

FUFINACE.

Specification of Letters Patent.

Patented May 1, 1906.

Application llad Hay 23. 1995. Serial No, 261,773.

To (LEZ whom t may concern,

Be it known that I, JOHN C. TELLER, a citizen of the United States, residing at `Hinneapolis, in the county of Hennepin and State of .\[innesota, have invented certain new and riseful Improvements in Furnaces; and I do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to furnaces, and especially to those that are used in connection with water-tube boilers for generatingsteam.

The primary objectof my invention 'is to provide certain improvements whereby a more effect and complete combustion is obtaine thereby accom lishing two important results-to wit, the urning of the smoke and economy in the use of fuel.

To the above ends the invention consists of the novel devices and combinations of devices hereinafter described, and defined in the claims.

In the accompanyin drawings, which illustrate the invention, li e characters indicate like parte throughout the several views.

Figure 1 is a view in vertical section taken longitudinally through a furnace and a watertube boiler, the same. havin? incorporated therein the several features of my invention. Fi 2 is a transverse vertical section, on an en ared scale, taken approximately on the line :c zr of Fig. 1, some parts being removed and some being broken away; and Fig. 3 is a front elevation ofsubstantially those parts of the furnace that are located in front of the parte shown in Fig. 2.

The numeral 1 indicates the exterior brickwork or masonry of the furnace, within which is placed an inclined watentube boiler of standard construction, the same comprising a stack of inclined' watertubes 3 Vand an overlying cylindrical dome 3 and the said parts 2 and 3 being in communication thrnuvh connectinU-tubes Il and 5. This water-tu e boiler is ofstandard construction, being what is known to the trade as the Babcock and IVilcox boiler. The intermediate portion of the tubes 2 rests upon and extends through the transverse fire-wall 6, and the s aces between the tubes in line with the sai lire-wall 6 are filled in with fire-clay or brick, (indicated at 6*.) A deflectin plate or wall 7 extends laterally forward rom the {ire-wall 6 over the stack of tubes 2. A deecting-partition 8 extends over the tubes 2 between the fire-wall and the rear wall or inrlosing.,r brickwork 1. Below and approximatelv Yin line with the partition S lire-clay or briclrs 8 are filled in the spaces between the water-tubes '2.

The gratas 9 are located in the primary combustion chamber formed in the conipartment located between the firewall 6 und the fire-wall of the furnace, and they are supported in the usual way.

The numeral 10 indicates a doorclosed opening, which is adapted to be closed by hinffed doors l s of usual construction. A

lf'ithin the p imarv conibustion-chamber, overlying the incline portion of the grate 9. is a fire arch or dome, made up oi segmental top blocks il, vertically-dis osed side blocks l2, and vertically-dispose end blocks 13, which blocks are preferably constructed of fire-clay. The inner end plate formed b v the blocks 13 preferably terminates about half-wa between the grate 9 and the arched top of t e dome. The top blocks ll and end blocks 13 and certain of the side blocks it! are formed with airpassages 14 and 15. The air-passages 14 of the alined blocks l1 and i3 register with each other to form long inwardly extended and then downwardlyturned air-ducts that open at the lower edge ot the vertical inner wall of the dome or fire-arch. The said air-ducts 14 at their outer outer extremities revister with airducts 16 in the front wall of the lire-box. The side air-ducts 15 at their outer extremities .register with air-ducts l? in the front wall of the fire-box. The inner extremities of the air-ducts l5 open into the lire-box at the sides thereof, Just below the vertical inner wall of the fire arch or dome. The outer extremities of the air-ducts 16 and i7 are made larinv, and they are adapted to be opened to any desired extent and closed by means of the damper-valves i8 and 18, res actively.

The numeral 19 indicates an out et for the products of combustion which is located in cates with a smoke-stack. (Not shown.)

With the furnace designed as above illustrated the products of combustion are made to take a Winding course, substantially as indicated by the arrows marked on Fig. l, by reference to which it will be noted that in their first passage between the waterl tubes 2 they are, by the deflecting-plate 7, caused to travel rearward to or approximately to the upper ends of said tubes, from the rear wall of the masonry l and communi- IOS thence along the under surface of the dome over the fire-wall G, thence vertically downward between the water-tubes, and thence again upward between the said water-tubes and out through the passage 10. In taking this winding course the flame and the roducts of combustion are caused to trave over the entire surface of the water-tubes, thus producing extremely-hot steam-generating action. The combustion is very greatly intensifled in the primary combustion-chamber, and particularly in the vicinity of the inner wall of the tire-arch, by the introduction of the oxygen or air drawn into said combustion-chamber through the air-ducts 14 and 15. By this introduction of air the combustion throughout the several compartments i of the firebox is greatly increased, and bv this increased combustion the smoke and all i combustible particles Will be completely or i nearly completely burned, so that there will be no annoyance from smoke and a very great economy in fuel will be effected. My improvements in their application to furnaces of the character above described l and to other furnaces will add very little, if f l anything, to the usual cost thereof and when applied have in ractice been found extremely efficient or the purposes had inf view. The abatement of the smoke nuisance in cities is one which has called forth much effort and which I do not believe has been i satisfactorily solved prior to this invention.

ciales believe, however, that I have accomplished the objectsof my invention--to wit, the hurnnglof the smoke and economy in the use of From what has been said it will be understood that the furnace above described is capable of modifications within the scope of' my invention as herein set forth and claimed.

What I claim, and desire to secure by Letters Patent of the United States, is as follows:

l. In a furnace, the combination with a A fire-arch having a depending transverse inner wall formed of blocks provided with air-pasl sages forming, when put together, independent air-ducts; said air-ducts having dampercontrolled inlets, substantially as described.

2. In a furnace, the combination with a fire-arch provided with side walls and a transverse inner wall. formed of blocks provided with air-passages which, when the blocks are put together, form independent air-ducts in the side walls below the transverse inner wall and in the arch and depend ing transverse wall, and inde endent dampers controllingr the inlets of t e several airducts, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN C. TELLER.

Witnesses H. D. KILGoRE, ROBERT C. MAYBE?. 

